How is it that possible that someone can lost in Trading when he or she is making huge profit?
A trader can see good profit but if he uses a bad order on an exchange with small trading volume, he can make mistakes when selling to take profit. Like using Market price order type, after his sell order is filled, he might not get profit, but loss.
If a trader already sells his bitcoin successfully and gets profit, a next possibility of loss is making mistake when withdrawal. Like sending it to a wrong address or fail to withdraw from a centralized exchange because it is a scam exchange.